I might add that Rolex and Patek collectors are way more OCD than IWC collectors. Thank goodness for that. I don't know much about the Patek world, but when I browse auction catalogs, there is tremendous differentiation even within one model. However, vintage and neo-vintage Rolex collectors take the cake for fussiness over arcane details. They even have their own language! And there are a world of fakes and frankensteins that a collector has to deal with.
As an IWC collector, I thank heaven, that we haven't resorted to that level of minutiae.
As a side note, I remember Richard Paige, who was an IWC dealer in Northern California, tell MF and Kurt Klaus at a gathering in 2000, that he couldn't give the Jubilees away, even at substantial discounts, when they were introduced in 1993-94. So if you consider you could have bought a 5441 in steel for say $5000 or less, back in the day, then they've appreciated more than 150%. Fair return, I'd say.